Weird breathing sound but won't restart on battery drain for Calibrate - MacBook Pro 15" Retina Display Mid 2012 - iFixit
What is the officially 'best' way to keep a MacBook's battery healthy and long-lasting? Is it better to charge to full and unplug it, or charge only when necessary? - Quora
![Smart Battery Calibration & Maintenance on Macbook Pro Retina & Air | P&T IT BROTHER - Computer Repair Laptops, Mac, Cellphone, Tablets (Windows, Mac OS X, iOS, Android) Smart Battery Calibration & Maintenance on Macbook Pro Retina & Air | P&T IT BROTHER - Computer Repair Laptops, Mac, Cellphone, Tablets (Windows, Mac OS X, iOS, Android)](https://www.pntbrother.com/wp-content/uploads/2015/01/macbookcalibration.jpg)